Lambda back-end should generate invokespecial for method handles referring to private instance methods

Example 2

Source:

public class InstanceLambda {

  public void m() {
    Runnable r = ()->m();
  }

}

---

javap of javac output (Lambda b76):

Classfile /Users/dan/Dev/misc/classes/InstanceLambda.class
...
  BootstrapMethods:
    0: #16 invokestatic java/lang/invoke/LambdaMetafactory.metaFactory:(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite;
      Method arguments:
        #17 invokeinterface java/lang/Runnable.run:()V
        #18 invokevirtual InstanceLambda.lambda$0:()V [***** Note invocation mode: invokevirtual *****]
        #19 ()V
{
...
  public void m();
    flags: ACC_PUBLIC
    Code:
      stack=1, locals=2, args_size=1
         0: aload_0
         1: invokedynamic #2, 0 // InvokeDynamic #0:lambda$:(LInstanceLambda;)Ljava/lang/Runnable;
         6: astore_1
         7: return
...

  private void lambda$0();
    flags: ACC_PRIVATE, ACC_SYNTHETIC [***** Note access: private *****]
    Code:
      stack=1, locals=1, args_size=1
         0: aload_0
         1: invokevirtual #3 // Method m:()V
         4: return
...
}